chore: bump vault version to 1.20

[leoparente]

This pull request refactors the Vault test setup in the agent/secretsmgr package to use Docker-based test clusters instead of in-memory Vault servers. This change improves test reliability and better simulates real-world scenarios. Key updates include replacing the createTestVault function, updating imports, and modifying all test cases to use the new Docker-based setup.

Important Note

We were importing entire vault project for testing and it has led to breaking package while upgrading:

This repository publishes two libraries that may be imported by other projects: github.com/hashicorp/vault/api and github.com/hashicorp/vault/sdk.
Note that this repository also contains Vault (the product), and as with most Go projects, Vault uses Go modules to manage its dependencies. The mechanism to do that is the go.mod file. As it happens, the presence of that file also makes it theoretically possible to import Vault as a dependency into other projects. Some other projects have made a practice of doing so in order to take advantage of testing tooling that was developed for testing Vault itself. This is not, and has never been, a supported way to use the Vault project. We aren't likely to fix bugs relating to failure to import github.com/hashicorp/vault into your project.

https://github.com/hashicorp/vault/tree/c0f4c2052ef68e7cefe17ba171276158610f8ddd?tab=readme-ov-file#importing-vault

Refactor of Vault Test Setup

• Updated Vault test setup to use Docker-based clusters: The createTestVault function was rewritten to use docker.DockerCluster from the Vault SDK, replacing the previous in-memory Vault server setup. This enhances test reliability and mirrors production environments more closely. (agent/secretsmgr/vault_test.go, [1] [2]

Test Case Updates

• Replaced in-memory Vault server with Docker-based cluster in all test cases: All test cases (TestVaultManager_getSecret, TestVaultManager_processString, TestVaultManager_processMap, TestVaultManager_processSlice, TestVaultManager_SolvePolicySecrets, TestVaultManager_RegisterUpdatePoliciesCallback, TestVaultManager_pollSecrets) were updated to use the new Docker-based createTestVault function. The cleanup logic was simplified with cluster.Cleanup. (agent/secretsmgr/vault_test.go, [1] [2] [3] [4] [5] [6]

Import Adjustments

• Removed unused imports and added new dependencies: Unused imports related to the in-memory Vault server (net, vaulthttp, vaultsrv) were removed. New imports for Docker-based test clusters (testcluster, testcluster/docker) were added. (agent/secretsmgr/vault_test.go, agent/secretsmgr/vault_test.goL7-R79)

Address Handling

• Updated address handling for Docker-based clusters: Test cases now use cluster.ClusterNodes[0].HostPort instead of ln.Addr().String() for Vault server address configuration. (agent/secretsmgr/vault_test.go, agent/secretsmgr/vault_test.goL612-R595)

[github-actions]

Go test coverage

STATUS	ELAPSED	PACKAGE	COVER	PASS	FAIL	SKIP
🟢 PASS	0.17s	github.com/netboxlabs/orb-agent/agent	0.0%	0	0	0
🟢 PASS	0.17s	github.com/netboxlabs/orb-agent/agent/backend	0.0%	0	0	0
🟢 PASS	5.03s	github.com/netboxlabs/orb-agent/agent/backend/devicediscovery	76.0%	3	0	0
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent/backend/mocks	0.0%	0	0	0
🟢 PASS	5.03s	github.com/netboxlabs/orb-agent/agent/backend/networkdiscovery	75.8%	3	0	0
🟢 PASS	4.02s	github.com/netboxlabs/orb-agent/agent/backend/otel	76.4%	2	0	0
🟢 PASS	3.02s	github.com/netboxlabs/orb-agent/agent/backend/pktvisor	65.6%	2	0	0
🟢 PASS	5.03s	github.com/netboxlabs/orb-agent/agent/backend/snmpdiscovery	75.8%	3	0	0
🟢 PASS	5.03s	github.com/netboxlabs/orb-agent/agent/backend/worker	76.0%	3	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/config	100.0%	6	0	0
🟢 PASS	1.04s	github.com/netboxlabs/orb-agent/agent/configmgr	49.2%	9	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/policies	100.0%	15	0	0
🟢 PASS	1.02s	github.com/netboxlabs/orb-agent/agent/policymgr	70.3%	10	0	0
🟢 PASS	25.27s	github.com/netboxlabs/orb-agent/agent/secretsmgr	45.7%	45	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/version	100.0%	1	0	0

Total coverage: 58.0%

[github-actions]

🎉 This PR is included in version 2.3.0 🎉

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